[`ruff`] Improve autofix safety for `never-union` (RUF020) #36283

Workflow file for this run

	name: CI

	on:
	push:
	branches: [main]
	pull_request:
	workflow_dispatch:

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref_name }}-${{ github.event.pull_request.number \|\| github.sha }}
	cancel-in-progress: true

	env:
	CARGO_INCREMENTAL: 0
	CARGO_NET_RETRY: 10
	CARGO_TERM_COLOR: always
	RUSTUP_MAX_RETRIES: 10
	PACKAGE_NAME: ruff
	PYTHON_VERSION: "3.12"

	jobs:
	determine_changes:
	name: "Determine changes"
	runs-on: ubuntu-latest
	outputs:
	# Flag that is raised when any code that affects parser is changed
	parser: ${{ steps.changed.outputs.parser_any_changed }}
	# Flag that is raised when any code that affects linter is changed
	linter: ${{ steps.changed.outputs.linter_any_changed }}
	# Flag that is raised when any code that affects formatter is changed
	formatter: ${{ steps.changed.outputs.formatter_any_changed }}
	# Flag that is raised when any code is changed
	# This is superset of the linter and formatter
	code: ${{ steps.changed.outputs.code_any_changed }}
	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- uses: tj-actions/changed-files@v45
	id: changed
	with:
	files_yaml: \|
	parser:
	- Cargo.toml
	- Cargo.lock
	- crates/ruff_python_trivia/**
	- crates/ruff_source_file/**
	- crates/ruff_text_size/**
	- crates/ruff_python_ast/**
	- crates/ruff_python_parser/**
	- scripts/fuzz-parser/**
	- .github/workflows/ci.yaml

	linter:
	- Cargo.toml
	- Cargo.lock
	- crates/**
	- "!crates/ruff_python_formatter/**"
	- "!crates/ruff_formatter/**"
	- "!crates/ruff_dev/**"
	- scripts/*
	- python/**
	- .github/workflows/ci.yaml

	formatter:
	- Cargo.toml
	- Cargo.lock
	- crates/ruff_python_formatter/**
	- crates/ruff_formatter/**
	- crates/ruff_python_trivia/**
	- crates/ruff_python_ast/**
	- crates/ruff_source_file/**
	- crates/ruff_python_index/**
	- crates/ruff_text_size/**
	- crates/ruff_python_parser/**
	- crates/ruff_dev/**
	- scripts/*
	- python/**
	- .github/workflows/ci.yaml

	code:
	- "*/"
	- "!*/.md"
	- "!docs/**"
	- "!assets/**"

	cargo-fmt:
	name: "cargo fmt"
	runs-on: ubuntu-latest
	timeout-minutes: 10
	steps:
	- uses: actions/checkout@v4
	- name: "Install Rust toolchain"
	run: rustup component add rustfmt
	- run: cargo fmt --all --check

	cargo-clippy:
	name: "cargo clippy"
	runs-on: ubuntu-latest
	needs: determine_changes
	if: ${{ needs.determine_changes.outputs.code == 'true' \|\| github.ref == 'refs/heads/main' }}
	timeout-minutes: 20
	steps:
	- uses: actions/checkout@v4
	- name: "Install Rust toolchain"
	run: \|
	rustup component add clippy
	rustup target add wasm32-unknown-unknown
	- uses: Swatinem/rust-cache@v2
	- name: "Clippy"
	run: cargo clippy --workspace --all-targets --all-features --locked -- -D warnings
	- name: "Clippy (wasm)"
	run: cargo clippy -p ruff_wasm -p red_knot_wasm --target wasm32-unknown-unknown --all-features --locked -- -D warnings

	cargo-test-linux:
	name: "cargo test (linux)"
	runs-on: depot-ubuntu-22.04-16
	needs: determine_changes
	if: ${{ needs.determine_changes.outputs.code == 'true' \|\| github.ref == 'refs/heads/main' }}
	timeout-minutes: 20
	steps:
	- uses: actions/checkout@v4
	- name: "Install Rust toolchain"
	run: rustup show
	- name: "Install mold"
	uses: rui314/setup-mold@v1
	- name: "Install cargo nextest"
	uses: taiki-e/install-action@v2
	with:
	tool: cargo-nextest
	- name: "Install cargo insta"
	uses: taiki-e/install-action@v2
	with:
	tool: cargo-insta
	- uses: Swatinem/rust-cache@v2
	- name: "Run tests"
	shell: bash
	env:
	NEXTEST_PROFILE: "ci"
	run: cargo insta test --all-features --unreferenced reject --test-runner nextest

	# Check for broken links in the documentation.
	- run: cargo doc --all --no-deps
	env:
	RUSTDOCFLAGS: "-D warnings"
	# Use --document-private-items so that all our doc comments are kept in
	# sync, not just public items. Eventually we should do this for all
	# crates; for now add crates here as they are warning-clean to prevent
	# regression.
	- run: cargo doc --no-deps -p red_knot_python_semantic -p red_knot -p red_knot_test -p ruff_db --document-private-items
	env:
	# Setting RUSTDOCFLAGS because `cargo doc --check` isn't yet implemented (https://github.com/rust-lang/cargo/issues/10025).
	RUSTDOCFLAGS: "-D warnings"
	- uses: actions/upload-artifact@v4
	with:
	name: ruff
	path: target/debug/ruff

	cargo-test-windows:
	name: "cargo test (windows)"
	runs-on: windows-latest-xlarge
	needs: determine_changes
	if: ${{ needs.determine_changes.outputs.code == 'true' \|\| github.ref == 'refs/heads/main' }}
	timeout-minutes: 20
	steps:
	- uses: actions/checkout@v4
	- name: "Install Rust toolchain"
	run: rustup show
	- name: "Install cargo nextest"
	uses: taiki-e/install-action@v2
	with:
	tool: cargo-nextest
	- uses: Swatinem/rust-cache@v2
	- name: "Run tests"
	shell: bash
	env:
	# Workaround for <https://github.com/nextest-rs/nextest/issues/1493>.
	RUSTUP_WINDOWS_PATH_ADD_BIN: 1
	run: \|
	cargo nextest run --all-features --profile ci
	cargo test --all-features --doc

	cargo-test-wasm:
	name: "cargo test (wasm)"
	runs-on: ubuntu-latest
	needs: determine_changes
	if: ${{ needs.determine_changes.outputs.code == 'true' \|\| github.ref == 'refs/heads/main' }}
	timeout-minutes: 10
	steps:
	- uses: actions/checkout@v4
	- name: "Install Rust toolchain"
	run: rustup target add wasm32-unknown-unknown
	- uses: actions/setup-node@v4
	with:
	node-version: 20
	cache: "npm"
	cache-dependency-path: playground/package-lock.json
	- uses: jetli/[email protected]
	with:
	version: v0.13.1
	- uses: Swatinem/rust-cache@v2
	- name: "Test ruff_wasm"
	run: \|
	cd crates/ruff_wasm
	wasm-pack test --node
	- name: "Test red_knot_wasm"
	run: \|
	cd crates/red_knot_wasm
	wasm-pack test --node

	cargo-build-release:
	name: "cargo build (release)"
	runs-on: macos-latest
	needs: determine_changes
	if: ${{ github.ref == 'refs/heads/main' }}
	timeout-minutes: 20
	steps:
	- uses: actions/checkout@v4
	- name: "Install Rust toolchain"
	run: rustup show
	- name: "Install mold"
	uses: rui314/setup-mold@v1
	- uses: Swatinem/rust-cache@v2
	- name: "Build"
	run: cargo build --release --locked

	cargo-build-msrv:
	name: "cargo build (msrv)"
	runs-on: ubuntu-latest
	needs: determine_changes
	if: ${{ needs.determine_changes.outputs.code == 'true' \|\| github.ref == 'refs/heads/main' }}
	timeout-minutes: 20
	steps:
	- uses: actions/checkout@v4
	- uses: SebRollen/[email protected]
	id: msrv
	with:
	file: "Cargo.toml"
	field: "workspace.package.rust-version"
	- name: "Install Rust toolchain"
	run: rustup default ${{ steps.msrv.outputs.value }}
	- name: "Install mold"
	uses: rui314/setup-mold@v1
	- name: "Install cargo nextest"
	uses: taiki-e/install-action@v2
	with:
	tool: cargo-nextest
	- name: "Install cargo insta"
	uses: taiki-e/install-action@v2
	with:
	tool: cargo-insta
	- uses: Swatinem/rust-cache@v2
	- name: "Run tests"
	shell: bash
	env:
	NEXTEST_PROFILE: "ci"
	run: cargo +${{ steps.msrv.outputs.value }} insta test --all-features --unreferenced reject --test-runner nextest

	cargo-fuzz-build:
	name: "cargo fuzz build"
	runs-on: ubuntu-latest
	needs: determine_changes
	if: ${{ github.ref == 'refs/heads/main' }}
	timeout-minutes: 10
	steps:
	- uses: actions/checkout@v4
	- name: "Install Rust toolchain"
	run: rustup show
	- uses: Swatinem/rust-cache@v2
	with:
	workspaces: "fuzz -> target"
	- name: "Install cargo-binstall"
	uses: cargo-bins/cargo-binstall@main
	with:
	tool: [email protected]
	- name: "Install cargo-fuzz"
	# Download the latest version from quick install and not the github releases because github releases only has MUSL targets.
	run: cargo binstall cargo-fuzz --force --disable-strategies crate-meta-data --no-confirm
	- run: cargo fuzz build -s none

	fuzz-parser:
	name: "fuzz parser"
	runs-on: ubuntu-latest
	needs:
	- cargo-test-linux
	- determine_changes
	if: ${{ needs.determine_changes.outputs.parser == 'true' }}
	timeout-minutes: 20
	env:
	FORCE_COLOR: 1
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: ${{ env.PYTHON_VERSION }}
	- name: Install uv
	run: curl -LsSf https://astral.sh/uv/install.sh \| sh
	- name: Install Python requirements
	run: uv pip install -r scripts/fuzz-parser/requirements.txt --system
	- uses: actions/download-artifact@v4
	name: Download Ruff binary to test
	id: download-cached-binary
	with:
	name: ruff
	path: ruff-to-test
	- name: Fuzz
	run: \|
	# Make executable, since artifact download doesn't preserve this
	chmod +x ${{ steps.download-cached-binary.outputs.download-path }}/ruff

	python scripts/fuzz-parser/fuzz.py 0-500 --test-executable ${{ steps.download-cached-binary.outputs.download-path }}/ruff

	scripts:
	name: "test scripts"
	runs-on: ubuntu-latest
	needs: determine_changes
	if: ${{ needs.determine_changes.outputs.code == 'true' \|\| github.ref == 'refs/heads/main' }}
	timeout-minutes: 5
	steps:
	- uses: actions/checkout@v4
	- name: "Install Rust toolchain"
	run: rustup component add rustfmt
	- uses: Swatinem/rust-cache@v2
	- run: ./scripts/add_rule.py --name DoTheThing --prefix PL --code C0999 --linter pylint
	- run: cargo check
	- run: cargo fmt --all --check
	- run: \|
	./scripts/add_plugin.py test --url https://pypi.org/project/-test/0.1.0/ --prefix TST
	./scripts/add_rule.py --name FirstRule --prefix TST --code 001 --linter test
	- run: cargo check
	- run: cargo fmt --all --check

	ecosystem:
	name: "ecosystem"
	runs-on: depot-ubuntu-latest-8
	needs:
	- cargo-test-linux
	- determine_changes
	# Only runs on pull requests, since that is the only we way we can find the base version for comparison.
	# Ecosystem check needs linter and/or formatter changes.
	if: ${{ github.event_name == 'pull_request' && needs.determine_changes.outputs.code == 'true' }}
	timeout-minutes: 20
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: ${{ env.PYTHON_VERSION }}

	- uses: actions/download-artifact@v4
	name: Download comparison Ruff binary
	id: ruff-target
	with:
	name: ruff
	path: target/debug

	- uses: dawidd6/action-download-artifact@v6
	name: Download baseline Ruff binary
	with:
	name: ruff
	branch: ${{ github.event.pull_request.base.ref }}
	workflow: "ci.yaml"
	check_artifacts: true

	- name: Install ruff-ecosystem
	run: \|
	pip install ./python/ruff-ecosystem

	- name: Run `ruff check` stable ecosystem check
	if: ${{ needs.determine_changes.outputs.linter == 'true' }}
	run: \|
	# Make executable, since artifact download doesn't preserve this
	chmod +x ./ruff ${{ steps.ruff-target.outputs.download-path }}/ruff

	# Set pipefail to avoid hiding errors with tee
	set -eo pipefail

	ruff-ecosystem check ./ruff ${{ steps.ruff-target.outputs.download-path }}/ruff --cache ./checkouts --output-format markdown \| tee ecosystem-result-check-stable

	cat ecosystem-result-check-stable > $GITHUB_STEP_SUMMARY
	echo "### Linter (stable)" > ecosystem-result
	cat ecosystem-result-check-stable >> ecosystem-result
	echo "" >> ecosystem-result

	- name: Run `ruff check` preview ecosystem check
	if: ${{ needs.determine_changes.outputs.linter == 'true' }}
	run: \|
	# Make executable, since artifact download doesn't preserve this
	chmod +x ./ruff ${{ steps.ruff-target.outputs.download-path }}/ruff

	# Set pipefail to avoid hiding errors with tee
	set -eo pipefail

	ruff-ecosystem check ./ruff ${{ steps.ruff-target.outputs.download-path }}/ruff --cache ./checkouts --output-format markdown --force-preview \| tee ecosystem-result-check-preview

	cat ecosystem-result-check-preview > $GITHUB_STEP_SUMMARY
	echo "### Linter (preview)" >> ecosystem-result
	cat ecosystem-result-check-preview >> ecosystem-result
	echo "" >> ecosystem-result

	- name: Run `ruff format` stable ecosystem check
	if: ${{ needs.determine_changes.outputs.formatter == 'true' }}
	run: \|
	# Make executable, since artifact download doesn't preserve this
	chmod +x ./ruff ${{ steps.ruff-target.outputs.download-path }}/ruff

	# Set pipefail to avoid hiding errors with tee
	set -eo pipefail

	ruff-ecosystem format ./ruff ${{ steps.ruff-target.outputs.download-path }}/ruff --cache ./checkouts --output-format markdown \| tee ecosystem-result-format-stable

	cat ecosystem-result-format-stable > $GITHUB_STEP_SUMMARY
	echo "### Formatter (stable)" >> ecosystem-result
	cat ecosystem-result-format-stable >> ecosystem-result
	echo "" >> ecosystem-result

	- name: Run `ruff format` preview ecosystem check
	if: ${{ needs.determine_changes.outputs.formatter == 'true' }}
	run: \|
	# Make executable, since artifact download doesn't preserve this
	chmod +x ./ruff ${{ steps.ruff-target.outputs.download-path }}/ruff

	# Set pipefail to avoid hiding errors with tee
	set -eo pipefail

	ruff-ecosystem format ./ruff ${{ steps.ruff-target.outputs.download-path }}/ruff --cache ./checkouts --output-format markdown --force-preview \| tee ecosystem-result-format-preview

	cat ecosystem-result-format-preview > $GITHUB_STEP_SUMMARY
	echo "### Formatter (preview)" >> ecosystem-result
	cat ecosystem-result-format-preview >> ecosystem-result
	echo "" >> ecosystem-result

	- name: Export pull request number
	run: \|
	echo ${{ github.event.number }} > pr-number

	- uses: actions/upload-artifact@v4
	name: Upload PR Number
	with:
	name: pr-number
	path: pr-number

	- uses: actions/upload-artifact@v4
	name: Upload Results
	with:
	name: ecosystem-result
	path: ecosystem-result

	cargo-shear:
	name: "cargo shear"
	runs-on: ubuntu-latest
	needs: determine_changes
	if: ${{ needs.determine_changes.outputs.code == 'true' \|\| github.ref == 'refs/heads/main' }}
	steps:
	- uses: actions/checkout@v4
	- uses: cargo-bins/cargo-binstall@main
	- run: cargo binstall --no-confirm cargo-shear
	- run: cargo shear

	python-package:
	name: "python package"
	runs-on: ubuntu-latest
	timeout-minutes: 20
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: ${{ env.PYTHON_VERSION }}
	architecture: x64
	- uses: Swatinem/rust-cache@v2
	- name: "Prep README.md"
	run: python scripts/transform_readme.py --target pypi
	- name: "Build wheels"
	uses: PyO3/maturin-action@v1
	with:
	args: --out dist
	- name: "Test wheel"
	run: \|
	pip install --force-reinstall --find-links dist ${{ env.PACKAGE_NAME }}
	ruff --help
	python -m ruff --help
	- name: "Remove wheels from cache"
	run: rm -rf target/wheels

	pre-commit:
	name: "pre-commit"
	runs-on: ubuntu-latest
	timeout-minutes: 10
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: ${{ env.PYTHON_VERSION }}
	- name: "Install Rust toolchain"
	run: rustup show
	- uses: Swatinem/rust-cache@v2
	- name: "Install pre-commit"
	run: pip install pre-commit
	- name: "Cache pre-commit"
	uses: actions/cache@v4
	with:
	path: ~/.cache/pre-commit
	key: pre-commit-${{ hashFiles('.pre-commit-config.yaml') }}
	- name: "Run pre-commit"
	run: \|
	echo '```console' > $GITHUB_STEP_SUMMARY
	# Enable color output for pre-commit and remove it for the summary
	SKIP=cargo-fmt,clippy,dev-generate-all pre-commit run --all-files --show-diff-on-failure --color=always \| \
	tee >(sed -E 's/\x1B\[([0-9]{1,2}(;[0-9]{1,2})*)?[mGK]//g' >> $GITHUB_STEP_SUMMARY) >&1
	exit_code=${PIPESTATUS[0]}
	echo '```' >> $GITHUB_STEP_SUMMARY
	exit $exit_code

	docs:
	name: "mkdocs"
	runs-on: ubuntu-latest
	timeout-minutes: 10
	env:
	MKDOCS_INSIDERS_SSH_KEY_EXISTS: ${{ secrets.MKDOCS_INSIDERS_SSH_KEY != '' }}
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: "3.13"
	- name: "Add SSH key"
	if: ${{ env.MKDOCS_INSIDERS_SSH_KEY_EXISTS == 'true' }}
	uses: webfactory/[email protected]
	with:
	ssh-private-key: ${{ secrets.MKDOCS_INSIDERS_SSH_KEY }}
	- name: "Install Rust toolchain"
	run: rustup show
	- name: Install uv
	uses: astral-sh/setup-uv@v3
	- uses: Swatinem/rust-cache@v2
	- name: "Install Insiders dependencies"
	if: ${{ env.MKDOCS_INSIDERS_SSH_KEY_EXISTS == 'true' }}
	run: uv pip install -r docs/requirements-insiders.txt --system
	- name: "Install dependencies"
	if: ${{ env.MKDOCS_INSIDERS_SSH_KEY_EXISTS != 'true' }}
	run: uv pip install -r docs/requirements.txt --system
	- name: "Update README File"
	run: python scripts/transform_readme.py --target mkdocs
	- name: "Generate docs"
	run: python scripts/generate_mkdocs.py
	- name: "Check docs formatting"
	run: python scripts/check_docs_formatted.py
	- name: "Build Insiders docs"
	if: ${{ env.MKDOCS_INSIDERS_SSH_KEY_EXISTS == 'true' }}
	run: mkdocs build --strict -f mkdocs.insiders.yml
	- name: "Build docs"
	if: ${{ env.MKDOCS_INSIDERS_SSH_KEY_EXISTS != 'true' }}
	run: mkdocs build --strict -f mkdocs.public.yml

	check-formatter-instability-and-black-similarity:
	name: "formatter instabilities and black similarity"
	runs-on: ubuntu-latest
	needs: determine_changes
	if: needs.determine_changes.outputs.formatter == 'true' \|\| github.ref == 'refs/heads/main'
	timeout-minutes: 10
	steps:
	- uses: actions/checkout@v4
	- name: "Install Rust toolchain"
	run: rustup show
	- name: "Cache rust"
	uses: Swatinem/rust-cache@v2
	- name: "Run checks"
	run: scripts/formatter_ecosystem_checks.sh
	- name: "Github step summary"
	run: cat target/formatter-ecosystem/stats.txt > $GITHUB_STEP_SUMMARY
	- name: "Remove checkouts from cache"
	run: rm -r target/formatter-ecosystem

	check-ruff-lsp:
	name: "test ruff-lsp"
	runs-on: ubuntu-latest
	timeout-minutes: 5
	needs:
	- cargo-test-linux
	- determine_changes
	if: ${{ needs.determine_changes.outputs.code == 'true' \|\| github.ref == 'refs/heads/main' }}
	steps:
	- uses: extractions/setup-just@v2
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

	- uses: actions/checkout@v4
	name: "Download ruff-lsp source"
	with:
	repository: "astral-sh/ruff-lsp"

	- uses: actions/setup-python@v5
	with:
	python-version: ${{ env.PYTHON_VERSION }}

	- uses: actions/download-artifact@v4
	name: Download development ruff binary
	id: ruff-target
	with:
	name: ruff
	path: target/debug

	- name: Install ruff-lsp dependencies
	run: \|
	just install

	- name: Run ruff-lsp tests
	run: \|
	# Setup development binary
	pip uninstall --yes ruff
	chmod +x ${{ steps.ruff-target.outputs.download-path }}/ruff
	export PATH=${{ steps.ruff-target.outputs.download-path }}:$PATH
	ruff version

	just test

	benchmarks:
	runs-on: ubuntu-22.04
	needs: determine_changes
	if: ${{ github.repository == 'astral-sh/ruff' && (needs.determine_changes.outputs.code == 'true' \|\| github.ref == 'refs/heads/main') }}
	timeout-minutes: 20
	steps:
	- name: "Checkout Branch"
	uses: actions/checkout@v4

	- name: "Install Rust toolchain"
	run: rustup show

	- name: "Install codspeed"
	uses: taiki-e/install-action@v2
	with:
	tool: cargo-codspeed

	- uses: Swatinem/rust-cache@v2

	- name: "Build benchmarks"
	run: cargo codspeed build --features codspeed -p ruff_benchmark

	- name: "Run benchmarks"
	uses: CodSpeedHQ/action@v3
	with:
	run: cargo codspeed run
	token: ${{ secrets.CODSPEED_TOKEN }}

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[`ruff`] Improve autofix safety for `never-union` (RUF020) #36283

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[`ruff`] Improve autofix safety for `never-union` (RUF020) #36283

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Workflow file for this run

[ruff] Improve autofix safety for never-union (RUF020) #36283

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[`ruff`] Improve autofix safety for `never-union` (RUF020) #36283